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Evidence for Living Things Changing Across Time

Evidence for Living Things Changing Across Time. Four Scientific Fields that Study Evidence of Change . Paleontology Physical Anthropology Developmental Biology Evolutionary Biology. Physical Anthropology.

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Evidence for Living Things Changing Across Time

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  1. Evidence for Living Things Changing Across Time

  2. Four Scientific Fields that Study Evidence of Change • Paleontology • Physical Anthropology • Developmental Biology • Evolutionary Biology

  3. Physical Anthropology • Physical Anthropologists are scientists who study how humans and their ancestors have changed biologically over time.

  4. Physical Anthropology

  5. Physical Anthropology • Similarities in skull structure offers evidence of common ancestry. • Changes in skull structure indicate change across time.

  6. Paleontology • The study of prehistoric life and evolutionary relationships through the fossil record.

  7. Paleontology • Evidence for Change through the fossil record

  8. Fossils Found in Strata

  9. Paleontology • Evidence for change across time • Fossil record shows gradual change over time of a large number of species • Higher Rock levels • Younger Fossils found here. • Fossils are similar to modern species • Lower Rock levels • Older fossils found • Fossils are much different from modern species

  10. Developmental Biologist • Scientists who study the stages of growth and development that living organisms pass through as they grow from fertilized egg to mature adult.

  11. Developmental Biologist • Embryology- Branch of developmental biology that focuses on the early development of organisms before they are born or hatched. • Embryo- Developing organisms during the prebirth/prehatch stage.

  12. Evidence of ChangeSimilarity of early stages of development indicate common ancestor

  13. Evidence of ChangeThe more similar the later stages of embryos look alike, the closer the relation

  14. Evidence for change • The presence of DNA in ALL living organisms is evidence that all living things evolved from a common ancestor.

  15. Evidence of changeThe similarity of DNA sequencing is evidence of that these organisms share common ancestors.

  16. Our Closest Relation • The Bonobo’s and Chimpanzee’s DNA sequencing is 98% the same as Human DNA sequencing. • This is strong evidence that humans, chimpanzees and Bonobos share a common ancestor.

  17. Evolutionary Biology Evolutionary Biologists are scientists who study how living organisms change physically over time. Charles Darwin wrote “The Origin of Species” Evolution through Natural Selection

  18. Evolutionary Biologists • Homologous Structures- Characteristics that are similar among different organisms because they evolved from a common ancestor. • Vestigial Structures- Structures that seemingly serve no purpose in some animals that are functional in other animals.

  19. Homologous Structures • Evidence for common ancestor • Structures evolved and changed across time

  20. Vestigial Structures • Shows Evidence of change over time as structures that no longer serve a purpose are still present.

  21. Vestigial Structures • The Pelvic Girdle was functional in the ancestors of the modern Whale. • The structure no longer serves a purpose but is still present

  22. Human Vestigial Structures

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